单项选择题

One morning Pat went to a wood ______.

A．to get a little exercise
B．to take in some fresh air
C．hoping to get something to eat
D．to visit the rich owner
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单项选择题
How fast will a rocket go to escape completely from the Earth's gravity ______
A．Seventy miles per second.
B．Seven thousand miles per hour.
C．Twenty-five thousand miles per second.
D．Twenty-five thousand miles per hour.
单项选择题
What is the most important factor for a rocket to escape from the Earth
A．To travel as fast as it can.
B．To overcome the Earth gravity.
C．To get away from the air resistance.
D．To have strong power in its operation.
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